Prestress tensioning equipment for prestressed steel strand

Abstract

The invention relates to the technical field of prestressed steel strands, in particular to prestressed tensioning equipment for prestressed steel strands. The device comprises fixed frame bodies which are symmetrically arranged front and back, the two fixed frame bodies are connected through a plurality of longitudinal beams, the longitudinal beams are arranged at the four corners of the fixed frame bodies on the opposite sides respectively, supporting beams are arranged on bottom plates of the two fixed frame bodies in the length direction of the bottom plates, and a movable frame parallel to the longitudinal beams movably abuts against upper beams of the two supporting beams. A plurality of prestressed steel strands can be tensioned and released at the same time, the steel strands can be automatically tensioned in the process of penetrating the steel strands one by one, so that unnecessary procedures are reduced, the prestressed steel strands are operated synchronously and stressed in a balanced mode, the safety of the prestressed steel strands is guaranteed, the releasing mechanism is matched with tensioning equipment, and the tensioning efficiency of the prestressed steel strands is improved. The tensioning oil cylinder can be effectively liberated, the service life of the tensioning oil cylinder is remarkably prolonged on the premise that the tensioning strength of all the steel strands is guaranteed, and the problems existing in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed steel strands, in particular to prestressed tensioning equipment for prestressed steel strands. Background Art

[0002] Prestressed steel strands are mainly used in railways, highways, cross-river and cross-sea bridges, large industrial buildings, water conservancy, energy and geotechnical anchoring. They have the characteristics of high tensile strength, good elongation, low relaxation value, small stress loss and excellent fatigue resistance. Prestressed steel strands are steel products composed of multiple steel wires twisted together. The surface of carbon steel can be added with galvanized layer, zinc-aluminum alloy layer, aluminum layer, copper plating layer, epoxy resin coating, etc. as needed. Before the engineering structural components are subjected to external loads, pre-tensioning stress is applied to the steel strands in the tension module to improve the bending resistance and strength of the components and increase the durability of the components. For mechanical structures, it means to generate stress in advance, and the benefit is that it can improve the strength of the structure itself.

[0003] At present, in the construction of concrete structures, the tensioning and releasing of prestressed steel strands are key processes. The traditional prestressing tensioning methods include single (one by one) tensioning and group (multiple) tensioning. Among them, the tensioning and releasing of prestressed steel strands one by one is time-consuming and labor-intensive, and has the disadvantages of low tensioning and releasing precision and high manual operation intensity. There are also tensioning equipment that operates multiple prestressed steel strands at the same time, but it is difficult for such equipment to ensure the balanced force of each prestressed steel strand. For this reason, such equipment needs to perform an additional pre-tensioning process, that is, pre-tensioning the steel strands one by one to ensure the consistency of the tension of each steel strand, and then tensioning them uniformly with tensioning equipment that can be tensioned in groups. If the pre-tensioning process is not performed, some steel strands will break due to tension during the group tensioning process, while some steel strands will not be tensioned yet, making it difficult to guarantee product quality and posing safety risks. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a prestressed tensioning device for prestressed steel strands. The device has a reasonable structural design and is easy to operate. It can tension and release multiple prestressed steel strands at the same time without adding a prestressing process. The steel strands can be automatically tightened during the process of threading the steel strands one by one, so that the tension of each steel strand is maintained within a certain range, thereby reducing unnecessary processes. Multiple prestressed steel strands are operated synchronously and are subjected to balanced force on each other, which saves time and effort, greatly improves the accuracy of tensioning and releasing, reduces manual operation intensity, and ensures its safety. Through the cooperation of the release mechanism and the tensioning device, the tensioning cylinder can be effectively released during the concrete solidification process. On the premise of ensuring the tensioning strength of each steel strand, the service life of the tensioning cylinder is significantly improved, thereby solving the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] The prestressed tensioning equipment for prestressed steel strands comprises a fixed frame symmetrically arranged front and back, the two fixed frames are connected by a plurality of longitudinal beams, each longitudinal beam is respectively arranged at the four corners of the fixed frames on the opposite side, support beams are arranged on the bottom plates of the two fixed frames along their length direction, a mobile frame arranged parallel to the longitudinal beams is movably abutted against the two support beams, limiting beams movably abutted against the mobile frame are arranged on the inner walls of the side plates of the two fixed frames along their length direction, a clamping mechanism is arranged on the mobile frame on the left, an anchor withdrawal mechanism matched with the clamping mechanism is arranged in the mobile frame, a tensioning mechanism matched with the mobile frame is respectively arranged on the left baffle plates of the two fixed frames, a tensioning mechanism matched with the mobile frame is respectively arranged on the right baffle plates of the two fixed frames, and a synchronization mechanism matched with the mobile frame is arranged on the two support beams; and lifting ears are respectively arranged on the left and right ends of the top plate of the fixed frame.

[0007] Optionally, the clamping mechanism includes a fixed plate fixedly connected to the left opening of the movable frame, and a plurality of pressure anchors are arranged at intervals along the length direction of the left side of the fixed plate, and each pressure anchor is located in the area formed by the upper and lower longitudinal beams and the two fixed frames on the same side. The pressure anchor includes a pressure anchor plate, and the pressure anchor plate is connected to the fixed plate by a plurality of fixing bolts, and each fixing bolt between the fixed plate and the pressure anchor plate is sleeved with a spacer, and a plurality of first threading holes are respectively provided on the pressure anchor plate, and a first through hole connected to the pressure anchor plate is provided on the right side wall of the pressure anchor plate corresponding to the position of each first threading hole, and a second through hole matching the first through hole is provided on the left side wall of the fixed plate corresponding to the position of each first through hole, and the cross-section of the second through hole is conical and cylindrical, and the end with a larger diameter is arranged at On the left side wall of the fixed plate, the end with a smaller diameter is arranged on the right side wall of the fixed plate, and in each second through hole, an anchor is movably provided for being clamped therewith, the anchor is composed of two symmetrically arranged semi-conical blocks, and a second threading hole for the steel strand to pass through is arranged in the middle of the two semi-conical blocks, and a top piece is arranged in the first through hole corresponding to the position of the anchor, the top piece includes a top column arranged in the first through hole and a top sleeve extending out of the first through hole and abutting against the anchor, a third threading hole for the steel strand to pass through is arranged in the middle of the top piece, and a strong spring movably sleeved on the top column is arranged in the first through hole, the left end of the strong spring abuts against the inner wall of the first through hole, and the right end abuts against the top sleeve, and the axial center lines of the first threading hole, the second threading hole and the third threading hole are arranged colinearly.

[0008] Optionally, the anchor unloading mechanism comprises an anchor unloading frame arranged in the movable frame, the anchor unloading frame comprises an anchor unloading plate arranged parallel to the fixed plate, slides movably abutted against the movable frame are symmetrically arranged on the upper and lower sides of the anchor unloading plate, a plurality of reinforcing plates connected to the anchor unloading plate are arranged between the two slides, guide shafts are symmetrically arranged on the right side wall of the fixed plate near the front and rear end positions, guide sleeves are arranged on the right side wall of the anchor unloading plate corresponding to the positions of the two guide shafts, the two guide shafts respectively and successively move through the anchor unloading plate, the guide sleeves on the corresponding side are connected to the positioning baffle, cylinder fixing plates are respectively arranged at the front and rear ends of the two slides, cylinder pin shafts are vertically arranged in the movable frame corresponding to the positions of the two cylinder fixing plates, and the two cylinder pins The shafts are respectively fixed in the moving frame, and an anchor unloading cylinder is provided between the cylinder pin shaft and the cylinder fixing plate on the corresponding side, the cylinder sleeve of the anchor unloading cylinder is movably connected to the cylinder pin shaft, and its piston rod is connected to the cylinder fixing plate; a plurality of third through holes are respectively provided on the anchor unloading plate at the positions of each second through hole of the corresponding fixing plate, and an anchor unloading member is respectively provided on each third through hole, and the anchor unloading member includes an anchor unloading baffle plate movably abutted against the left side wall of the anchor unloading plate, and anchor unloading columns are respectively provided on the left and right sides of the anchor unloading baffle plate, the anchor unloading column on the right side is movably clamped in the corresponding third through hole, and the anchor unloading column on the left side is movably abutted against the anchor, and a fourth threading hole for the steel strand to pass through is provided in the middle of the anchor unloading member; the fourth threading hole is arranged colinearly with the axial center line of the first threading hole.

[0009] Optionally, the tensioning mechanism includes a first positioning member arranged at the front and rear ends of the mobile frame, the first positioning member is arranged on the left side of the mobile frame, a long hole is provided on the left baffle plate of the fixed frame corresponding to the position of the first positioning member, a locking screw horizontally passes through the long hole of the fixed frame and is connected to a tensioning ear plate arranged in the fixed frame, a tensioning hole matching the first positioning member is provided on the tensioning ear plate, and a locking nut threadedly connected to the locking screw abuts against the left baffle plate of the fixed shell.

[0010] Optionally, the first positioning member includes a first reinforcement ring arranged in the mobile frame, and a first pull plate positioning pin is provided on the mobile frame. The lower end of the first pull plate positioning pin vertically passes through the mobile frame and extends into the first reinforcement ring, and the upper end thereof is connected to the first lifting plate movably abutted against the mobile frame; the tightening hole cooperates with the first pull plate positioning pin.

[0011] Optionally, balancing baffles are symmetrically provided on the front and rear sides of the tensioning ear plate.

[0012] Optionally, the tensioning mechanism includes a second positioning member arranged at the front and rear ends of the mobile frame, the second positioning member is arranged on the right side of the mobile frame, and a tensioning cylinder is provided on the right side baffle of the fixed frame corresponding to the position of the second positioning member. The piston rod of the tensioning cylinder horizontally passes through the right side baffle of the fixed frame and extends into the fixed frame, and a tensioning hole matching the second positioning member is provided at the outer end of the piston rod.

[0013] Optionally, the second positioning member includes a second reinforcement ring arranged in the mobile frame, and a second pull plate positioning pin is provided on the mobile frame. The lower end of the second pull plate positioning pin vertically passes through the mobile frame and extends into the second reinforcement ring, and the upper end thereof is connected to a second lifting plate movably abutted on the mobile frame; the tensioning hole cooperates with the second pull plate positioning pin.

[0014] Optionally, the synchronization mechanism includes an external sensor arranged on the side wall of the support beam, the guide rod of the external sensor is fixedly connected to the support beam through a clamping seat, the guide rod is horizontally arranged along the length direction of the support beam, and the magnetic ring of the external sensor is movably sleeved on the guide rod; a synchronization fixing plate is provided at the bottom of the movable frame corresponding to the position of the magnetic ring, an L-shaped bracket is provided at the bottom of the synchronization fixing plate, and a connecting piece connected to the L-shaped bracket is provided on the magnetic ring.

[0015] Optionally, a plurality of connecting beams are respectively provided between the two longitudinal beams on the lower side, and the movable frame is movably abutted against each connecting beam; a plurality of pads are respectively provided at the bottom of the two longitudinal beams on the lower side and at the bottom of each connecting beam.

[0016] The present invention adopts the above technical scheme, which has the advantages of: it has a reasonable structural design and is easy to operate. It can tension and release multiple prestressed steel strands at the same time without adding a pre-tensioning process. In the process of threading the steel strands one by one, the steel strands can be automatically tightened to keep the tension of each steel strand within a certain range, thereby reducing unnecessary processes. Multiple prestressed steel strands are operated synchronously and are subjected to balanced force on each other, saving time and effort, greatly improving the accuracy of tensioning and releasing, reducing manual operation intensity, and ensuring its safety. Through the cooperation of the release mechanism and the tensioning equipment, the tensioning cylinder can be effectively released during the concrete solidification process. On the premise of ensuring the tensioning strength of each steel strand, the service life of the tensioning cylinder is significantly improved, solving the problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 The schematic diagram of the three-dimensional structure of the moving frame and the sheet placing mechanism is removed;

[0019] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0020] Figure 4 It is a schematic diagram of the left three-dimensional structure of the moving frame and the clamping mechanism;

[0021] Figure 5 It is a schematic diagram of the right three-dimensional structure of the moving frame and the clamping mechanism;

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the pressure anchor plate;

[0023] Figure 7 is a schematic diagram of the three-dimensional structure of the fixed plate;

[0024] Figure 8 Schematic diagram of the three-dimensional structure of the top piece;

[0025] Fig. 9 is a schematic diagram of the three-dimensional structure of the anchor;

[0026] Fig.10 It is a three-dimensional structural schematic diagram of the anchor withdrawal member;

[0027] Fig.11 It is a three-dimensional schematic diagram of the anchor withdrawal mechanism;

[0028] Fig.12 It is a three-dimensional structural schematic diagram of the release mechanism;

[0029] Fig.13 It is a schematic diagram of the three-dimensional structure of the top piece, the anchor and the anchor back piece;

[0030] In the figure, 1, fixed frame; 101, bottom plate; 102, side plate; 103, left baffle; 104, right baffle; 105, top plate; 2, longitudinal beam; 3, support beam; 4, mobile frame; 5, limit beam; 6, lifting ear; 7, fixed plate; 8, pressure anchor plate; 9, fixing bolt; 10, spacer; 11, first threading hole; 12, first through hole; 13, second through hole; 14, semi-conical block; 15, second threading hole; 16, top column; 17, top sleeve; 18, third threading hole; 19, strong spring; 20, anchor plate; 21, slide plate; 22, reinforcement plate; 23, guide shaft; 24, guide sleeve; 25, positioning baffle; 26, cylinder fixing plate; 27, cylinder pin Shaft; 28, anchor release cylinder; 29, third through hole; 30, anchor release baffle; 31, anchor release column; 32, fourth threading hole; 33, long hole; 34, locking screw; 35, tensioning ear plate; 36, tensioning hole; 37, locking nut; 38, first reinforcement ring; 39, first pull plate locating pin; 40, first lifting plate; 41, balance baffle; 42, tensioning cylinder; 43, tensioning hole; 44, second reinforcement ring; 45, second pull plate locating pin; 46, second lifting plate; 47, external sensor; 4701, guide rod; 4702, magnetic ring; 48, clamping seat; 49, synchronous fixing plate; 50, L-shaped bracket; 51, connecting piece; 52, connecting beam; 53, pad. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. In the following description, many specific details are described to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0032] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] like Figure 1-13As shown, in this embodiment, the prestressed tensioning equipment for prestressed steel strands includes a fixed frame 1 symmetrically arranged front and back, two fixed frames 1 are connected by a plurality of longitudinal beams 2, and each longitudinal beam 2 is respectively arranged at the four corners of the fixed frame 1 on the opposite side, and support beams 3 are arranged on the bottom plates 101 of the two fixed frames 1 along their length direction, a movable frame 4 arranged parallel to the longitudinal beams 2 is movably abutted on the two support beams 3, and a movable abutment is arranged on the inner walls of the side plates 102 of the two fixed frames 1 along their length direction. The limiting beam 5 on the mobile frame 4 is provided with a clamping mechanism on the left mobile frame 4, and an anchor undocking mechanism matched with the clamping mechanism is provided in the mobile frame 4. The left baffle plates 103 of the two fixed frames 1 are respectively provided with tensioning mechanisms matched with the mobile frame, and the right baffle plates 104 of the two fixed frames are respectively provided with tensioning mechanisms matched with the mobile frame 4. Both supporting beams 3 are provided with synchronization mechanisms matched with the mobile frame 4; and lifting ears 6 are respectively provided at the left and right ends of the top plate 105 of the fixed frame 1.

[0035] Optionally, the clamping mechanism includes a fixed plate 7 fixedly connected to the left opening of the mobile frame 4, and a plurality of pressure anchors are arranged at intervals along the length direction of the left side of the fixed plate 7, each of which is located in the area formed by the upper and lower longitudinal beams 2 and the two fixed frames 1 on the same side, and the pressure anchor includes a pressure anchor plate 8, which is connected to the fixed plate 7 by a plurality of fixing bolts 9, and a spacer sleeve 10 is sleeved on each of the fixing bolts 9 between the fixed plate 7 and the pressure anchor plate 8, and a plurality of first threading holes 11 are respectively provided on the pressure anchor plate 8, and a first through hole 12 connected to the pressure anchor plate 8 is provided on the right side wall of the pressure anchor plate 8 corresponding to the position of each first threading hole 11, and a second through hole 13 matching with the first through hole 12 is provided on the left side wall of the fixed plate 7 corresponding to the position of each first through hole 12, and the cross-section of the second through hole 13 is conical and cylindrical, and the end with a larger diameter is arranged on the left side of the fixed plate 7 The anchor is composed of two symmetrically arranged semi-conical blocks 14, and a second threading hole 15 for the steel strand to pass through is provided in the middle of the two semi-conical blocks 14. A top piece is provided in the first through hole 12 corresponding to the position of the anchor, and the top piece includes a top column 16 arranged in the first through hole 12 and a top sleeve 17 extending out of the first through hole 12 and abutting against the anchor. A third threading hole 18 for the steel strand to pass through is provided in the middle of the top piece. A strong spring 19 movably sleeved on the top column 16 is provided in the first through hole 12. The left end of the strong spring 19 abuts against the inner wall of the first through hole 12, and the right end abuts against the top sleeve 17. The axial center lines of the first threading hole 11, the second threading hole 15 and the third threading hole 18 are colinearly arranged.

[0036] Optionally, the anchor unloading mechanism comprises an anchor unloading frame arranged in the mobile frame 4, the anchor unloading frame comprises an anchor unloading plate 20 arranged parallel to the fixed plate 7, slide plates 21 movably abutting against the mobile frame 4 are symmetrically arranged on the upper and lower sides of the anchor unloading plate 20, and a plurality of reinforcing plates 22 connected to the anchor unloading plate 20 are arranged between the two slide plates 21, guide shafts 23 are symmetrically arranged on the right side wall of the fixed plate 7 near the front and rear end positions, and guide sleeves 24 are arranged on the right side wall of the anchor unloading plate 20 corresponding to the positions of the two guide shafts 23, the two guide shafts 23 are movably passed through the anchor unloading plate 20 in turn, and the guide sleeves 24 on the corresponding side are connected to the positioning baffle 25, cylinder fixing plates 26 are respectively arranged at the front and rear ends of the two slide plates 21, and cylinder pin shafts 27 are vertically arranged in the mobile frame 4 corresponding to the positions of the two cylinder fixing plates 26. The pin shafts 27 are respectively fixedly connected in the movable frame 4, and an anchor-removing cylinder 28 is provided between the cylinder pin shaft 27 and the cylinder fixing plate 26 on the corresponding side. The cylinder sleeve of the anchor-removing cylinder 28 is movably connected to the cylinder pin shaft 27, and its piston rod is connected to the cylinder fixing plate 26; a plurality of third through holes 29 are respectively provided on the anchor-removing plate 20 at the positions of each second through hole 13 of the fixing plate 7, and an anchor-removing member is respectively provided on each third through hole 29, and the anchor-removing member includes an anchor-removing baffle 30 movably abutted on the left side wall of the anchor-removing plate 20, and anchor-removing columns 31 are respectively provided on the left and right sides of the anchor-removing baffle 30, the right anchor-removing column 31 is movably clamped in the corresponding third through hole 29, and the left anchor-removing column 31 is movably abutted on the anchor, and a fourth threading hole 32 for the steel strand to pass through is provided in the middle of the anchor-removing member; the fourth threading hole is arranged colinearly with the axial center line of the first threading hole.

[0037] Optionally, the tensioning mechanism includes a first positioning member arranged at the front and rear ends of the mobile frame 4, the first positioning member is arranged on the left side of the mobile frame 4, and a long hole 33 is provided on the left side baffle 103 of the fixed frame 1 corresponding to the position of the first positioning member, a locking screw 34 horizontally passes through the long hole 33 of the fixed frame 1 and is connected to a tensioning ear plate 35 arranged in the fixed frame 1, and a tensioning hole 36 matching the first positioning member is provided on the tensioning ear plate 35, and a locking nut 37 threadedly connected to the locking screw 34 abuts against the left side baffle 103 of the fixed shell 1.

[0038] Optionally, the first positioning member includes a first reinforcement ring 38 arranged in the mobile frame 4, and a first pull plate positioning pin 39 is provided on the mobile frame 4. The lower end of the first pull plate positioning pin 39 vertically passes through the mobile frame 4 and extends into the first reinforcement ring 38, and the upper end thereof is connected to the first lifting plate 40 movably abutted on the mobile frame 4; the tightening hole 36 cooperates with the first pull plate positioning pin 39.

[0039] Optionally, balancing baffles 41 are symmetrically provided on both sides of the tensioning lug 35. The balancing baffles 41 on both sides can ensure that the tensioning lug 35 is always in a horizontal state when it is not connected to the first positioning member.

[0040] Optionally, the tensioning mechanism includes a second positioning member arranged at the front and rear ends of the mobile frame 4, the second positioning member is arranged on the right side of the mobile frame 4, and a tensioning cylinder 42 is provided on the right side baffle 104 of the fixed frame 1 corresponding to the position of the second positioning member. The piston rod of the tensioning cylinder 42 horizontally passes through the right side baffle 104 of the fixed frame 1 and extends into the fixed frame 1, and a tensioning hole 43 matching the second positioning member is provided at the outer end of the piston rod.

[0041] Optionally, the second positioning member includes a second reinforcement ring 44 arranged in the mobile frame 4, and a second pull plate positioning pin 45 is provided on the mobile frame 4. The lower end of the second pull plate positioning pin 45 vertically passes through the mobile frame 4 and extends into the second reinforcement ring 44, and the upper end thereof is connected to a second lifting plate 46 movably abutted on the mobile frame 4; the tensioning hole 43 cooperates with the second pull plate positioning pin 45.

[0042] Optionally, the synchronization mechanism includes an external sensor 47 arranged on the side wall of the support beam 3, the guide rod 4701 of the external sensor 47 is fixedly connected to the support beam 3 through a clamping seat 48, the guide rod 4701 is horizontally arranged along the length direction of the support beam 3, and the magnetic ring 4702 of the external sensor 47 is movably sleeved on the guide rod 4701; a synchronization fixing plate 49 is provided at the bottom of the movable frame 4 corresponding to the position of the magnetic ring 4702, an L-shaped bracket 50 is provided at the bottom of the synchronization fixing plate 49, and a connecting piece 51 connected to the L-shaped bracket 50 is provided on the magnetic ring 4702.

[0043] Optionally, a plurality of connecting beams 52 are respectively provided between the two longitudinal beams 2 at the lower side, and the mobile frame 4 is movably abutted against each connecting beam 52; a plurality of pads 53 are respectively provided at the bottom of the two longitudinal beams 2 at the lower side and at the bottom of each connecting beam 52. Each connecting beam 52 can improve the connection stability of the entire device on the one hand, and can further support the mobile frame 4 on the other hand, so that it can slide back and forth more stably on the connecting beam 52 and the support beam 3.

[0044] Optionally, the locking nut can fix the locking screw after the tensioning is in place, so that even if the sealing of the tensioning cylinder and its hydraulic system is slightly poor, the moving frame will not move under the action of the tensioning force of the steel strand, so that the tensioning force of the steel strand will not decay during the long period of pouring and curing.

[0045] When the device is in use, the steel strands are first straightened and laid in the mold using the steel bar dragging and dropping machine. Under the action of the rotating resistance of the steel strand reel, all the steel strands are approximately straightened, the sagging amount is relatively close, and the length is basically the same. When doing the tensioning process, the two tensioning cylinders 42 can be connected to the second positioning member first, and the second lifting plate 46 is first pulled upward by hand to remove the second pull plate positioning pin 45 from the second reinforcement ring 44, and then the mobile frame 4 is moved to the side of the piston rod of the tensioning cylinder 42. When the tensioning hole 43 on the piston rod is opposite to the second reinforcement ring 44, the second pull plate positioning pin 45 is restored to its original position, thereby realizing the connection between the tensioning cylinder 42 and the mobile frame 4. Then, each prestressed steel strand is passed through between the two longitudinal beams 2 on the right side, and the ends of the steel strands are inserted into the anchor withdrawal frame one by one, and then passed through the fourth threading hole 32 of the anchor withdrawal member, the second threading hole 15 of the anchor, the third threading hole 18 of the top member, and the first threading hole 11 of the anchor plate 8 in turn, and then extended outward. During the insertion process, the piston rods of the two anchor withdrawal cylinders 28 extend outward, and the anchor withdrawal plate 20 drives each anchor withdrawal member to move, and then through the anchor withdrawal column 31 on the left side of the anchor withdrawal member, the anchor on the corresponding side is pressed to move to the left, so that it is separated from the second through hole 13. At this time, the left ends of the two semi-conical blocks 14 are no longer bound by the second through hole 13, and gradually separated under the pushing of the top member, thereby expanding the diameter of the second threading hole 15, facilitating the smooth insertion of the steel strand, and the anchor will also press the top member to move it to the left in the first through hole 12, and compress the strong spring 19 to continuously tighten. When all the steel strands pass through the corresponding anchor-removing mechanism and the clamping mechanism, the two anchor-removing oil cylinders 28 are started to make their piston rods shrink and move, so that the anchor-removing member that originally abuts and applies force to the anchor is separated from it and no longer applies force. At this time, the top sleeve 17 of the top member pushes the two semi-conical blocks 14 of the anchor on the corresponding side under the restoring force of the strong spring 19, so that it gradually fits into the second through hole 13 on the corresponding side, and the diameter of the second threading hole 15 is made smaller and smaller through the second through hole 13, so that the steel strands are clamped tighter and tighter. The anchor-removing frame always moves horizontally along the guide shaft 23 on the corresponding side under the action of the guide sleeves 24 at the front and rear ends to ensure the stability of the movement. Then, the two tensioning cylinders 42 are started, and the piston rods of the tensioning cylinders 42 push the movable frame 4 to move to the left, and the movable frame 4 drives the steel strands clamped in each second through hole 13 to move together through the fixed plate 7. During the movement, the steel strands can continue to move to the left, thereby realizing the tensioning process of multiple prestressed steel strands.In order to ensure the synchronization of the two tensioning cylinders 42, the synchronization mechanisms on the front and rear sides work, and the synchronization fixing plate 49 and the L-shaped bracket 50 at the bottom of the mobile frame 4 pull the magnetic ring 4702 to slide on the guide rod 4701 through the connecting piece 51. When the specified distance is reached, the external sensor 47 transmits the signal to the control system, and the control system controls the tensioning cylinder 42 on that side to stop working. Only after the external sensors 47 on both sides transmit the signal, the tensioning cylinders 42 on both sides can stop, so as to ensure that the tensioning distance and force of the steel strands are exactly the same.

[0046] When the tensioning process is performed, the first lifting plate 40 is pulled upward by hand to pull the first tensioning positioning pin 39 out of the mobile frame 4. Then the locking nut 37 is screwed to adjust the length of the locking screw 34 extending into the fixed frame 1. After the tensioning hole 36 of the tensioning ear plate 35 coincides with the position of the first reinforcement ring 38 of the first positioning member, the first tensioning positioning pin 39 is reinserted into the mobile frame 4 so that it passes through the tensioning hole 36 and the first reinforcement ring 38 in sequence, thereby fixing the tensioning ear plate 35 on the mobile frame 4. At this time, the locking screw 34 is fixed to the fixed frame 1 by the locking nut 37, thereby locking the position of the locking screw, so that even if the sealing of the tensioning cylinder 42 and its hydraulic system is slightly poor, the mobile frame 4 will not move under the action of the tensioning force of the steel strand, so that the tensioning force of the steel strand will not decay during the long period of casting and curing.

[0047] After the concrete structure solidifies, the anchor release mechanism is started, and the anchor release cylinder 28 pushes the anchor release frame, and then through the anchor release plate 20, each anchor release member on the anchor release plate 20 pushes the anchor on the corresponding side and separates from the second through hole 13. In this way, the anchor no longer clamps the steel strand, so that after the movable frame 4 moves to the left, each steel strand can be easily pulled out. It should be noted that the solidification of concrete requires a long time to stand, and the tensioning cylinder 42 cannot maintain a stable tension for a long time. Therefore, by adding a tensioning process, a stable tension can be provided for each steel strand, and the tensioning cylinder 42 can be effectively released to extend its service life. It has a reasonable structural design and is easy to operate. It can tension and release multiple prestressed steel strands at the same time without adding a pre-tensioning process. The steel strands can be automatically tightened during the process of threading the steel strands one by one, so that the tension of each steel strand is maintained within a certain range, thereby reducing unnecessary processes. Multiple prestressed steel strands are operated synchronously and are subjected to balanced force on each other, saving time and effort, greatly improving the accuracy of tensioning and releasing, reducing manual operation intensity, and ensuring its safety. Through the cooperation of the release mechanism and the tensioning equipment, the tensioning cylinder can be effectively released during the concrete solidification process. On the premise of ensuring the tensioning strength of each steel strand, the service life of the tensioning cylinder is significantly improved, and the problems existing in the prior art are solved.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. For those skilled in the art, any replacement, improvement or change made to the implementation mode of the present invention falls within the protection scope of the present invention.

[0049] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Prestressing tensioning equipment for prestressed steel strands, characterized in that: It includes a fixed frame body symmetrically arranged front and back, the two fixed frames are connected by a plurality of longitudinal beams, each longitudinal beam is respectively arranged at the four corners of the fixed frames on the opposite side, support beams are arranged on the bottom plates of the two fixed frames along the length direction, a mobile frame arranged parallel to the longitudinal beams is movably abutted on the two support beams, and limiting beams movably abutted on the mobile frames are arranged on the inner walls of the side plates of the two fixed frames along the length direction, a clamping mechanism is arranged on the mobile frame on the left, an anchor withdrawal mechanism matched with the clamping mechanism is arranged in the mobile frame, a tensioning mechanism matched with the mobile frame is respectively arranged on the left baffle plates of the two fixed frames, a tensioning mechanism matched with the mobile frame is respectively arranged on the right baffle plates of the two fixed frames, and a synchronization mechanism matched with the mobile frame is arranged on the two support beams; and lifting ears are respectively arranged on the left and right ends of the top plate of the fixed frame.

2. The prestressing tensioning device for prestressed steel strands according to claim 1, characterized in that: The clamping mechanism includes a fixed plate fixedly connected to the left opening of the mobile frame, and a plurality of pressure anchors are arranged at intervals along the length direction of the left side of the fixed plate, and each pressure anchor is located in the area formed by the upper and lower longitudinal beams and the two fixed frames on the same side. The pressure anchor includes a pressure anchor plate, and the pressure anchor plate is connected to the fixed plate by a plurality of fixing bolts, and each fixing bolt between the fixed plate and the pressure anchor plate is sleeved with a spacer, and a plurality of first threading holes are respectively provided on the pressure anchor plate, and a first through hole connected to the pressure anchor plate is provided on the right side wall of the pressure anchor plate corresponding to the position of each first threading hole, and a second through hole matching the first through hole is provided on the left side wall of the fixed plate corresponding to the position of each first through hole, and the cross section of the second through hole is conical, and the end with a larger diameter is arranged on the fixed On the left side wall of the plate, the end with a smaller diameter is arranged on the right side wall of the fixed plate, and in each second through hole, an anchor is movably provided for being clamped therewith, the anchor is composed of two symmetrically arranged semi-conical blocks, and a second threading hole for the steel strand to pass through is provided in the middle of the two semi-conical blocks, and a top piece is provided in the first through hole corresponding to the position of the anchor, the top piece includes a top column arranged in the first through hole and a top sleeve extending out of the first through hole and abutting against the anchor, a third threading hole for the steel strand to pass through is provided in the middle of the top piece, and a strong spring movably sleeved on the top column is provided in the first through hole, the left end of the strong spring abuts against the inner wall of the first through hole, and the right end abuts against the top sleeve, and the axial center lines of the first threading hole, the second threading hole and the third threading hole are arranged colinearly.

3. The prestressing tensioning device for prestressed steel strands according to claim 2, characterized in that: The anchor unloading mechanism comprises an anchor unloading frame arranged in the movable frame, and the anchor unloading frame comprises an anchor unloading plate arranged parallel to the fixed plate, and slide plates movably abutted in the movable frame are symmetrically arranged on the upper and lower sides of the anchor unloading plate, and a plurality of reinforcing plates connected to the anchor unloading plate are arranged between the two slide plates, and guide shafts are symmetrically arranged on the right side wall of the fixed plate near the front and rear end positions, and guide sleeves are arranged on the right side wall of the anchor unloading plate corresponding to the positions of the two guide shafts, and the two guide shafts are movably passed through the anchor unloading plate and the guide sleeves on the corresponding side are connected with the positioning baffles in turn, and oil cylinder fixing plates are respectively arranged at the front and rear ends of the two slide plates, and oil cylinder pin shafts are respectively vertically arranged in the movable frame corresponding to the positions of the two oil cylinder fixing plates, and the two oil cylinder pin shafts are respectively The cam is fixedly connected in the moving frame, and an anchor unloading cylinder is provided between the cylinder pin shaft and the cylinder fixing plate on the corresponding side, the cylinder sleeve of the anchor unloading cylinder is movably connected with the cylinder pin shaft, and its piston rod is connected with the cylinder fixing plate; a plurality of third through holes are respectively provided on the anchor unloading plate at the positions of each second through hole of the corresponding fixing plate, and an anchor unloading member is respectively provided on each third through hole, and the anchor unloading member includes an anchor unloading blocking piece movably abutted against the left side wall of the anchor unloading plate, and anchor unloading columns are respectively provided on the left and right sides of the anchor unloading blocking piece, the anchor unloading column on the right side is movably clamped in the corresponding third through hole, and the anchor unloading column on the left side is movably abutted against the anchor, and a fourth threading hole for the steel strand to pass through is provided in the middle of the anchor unloading member; the fourth threading hole is arranged colinearly with the axial center line of the first threading hole.

4. The prestressing tensioning device for prestressed steel strands according to claim 1, characterized in that: The tensioning mechanism includes a first positioning member arranged at the front and rear ends of the mobile frame, the first positioning member is arranged on the left side of the mobile frame, a long hole is arranged on the left baffle plate of the fixed frame corresponding to the position of the first positioning member, a locking screw horizontally passes through the long hole of the fixed frame and is connected to the tensioning ear plate arranged in the fixed frame, a tensioning hole matching the first positioning member is arranged on the tensioning ear plate, and a locking nut threadedly connected to the locking screw abuts against the left baffle plate of the fixed shell.

5. The prestressing tensioning device for prestressed steel strands according to claim 4, characterized in that: The first positioning member includes a first reinforcement ring arranged in the mobile frame, and a first pull plate positioning pin is provided on the mobile frame. The lower end of the first pull plate positioning pin vertically passes through the mobile frame and extends into the first reinforcement ring, and the upper end is connected to the first lifting plate movably abutted on the mobile frame; the tightening hole cooperates with the first pull plate positioning pin.

6. The prestressing tensioning device for prestressed steel strands according to claim 4, characterized in that: Balance baffles are symmetrically arranged on the front and rear sides of the tensioning ear plate.

7. The prestressing tensioning device for prestressed steel strands according to claim 1, characterized in that: The tensioning mechanism includes a second positioning member arranged at the front and rear ends of the mobile frame, the second positioning member is arranged on the right side of the mobile frame, and a tensioning cylinder is provided on the right side baffle of the fixed frame corresponding to the position of the second positioning member. The piston rod of the tensioning cylinder horizontally passes through the right side baffle of the fixed frame and extends into the fixed frame, and a tensioning hole matching the second positioning member is provided at the outer end of the piston rod.

8. The prestressing tensioning device for prestressed steel strands according to claim 7, characterized in that: The second positioning member includes a second reinforcement ring arranged in the mobile frame, and a second pull plate positioning pin is provided on the mobile frame. The lower end of the second pull plate positioning pin vertically passes through the mobile frame and extends into the second reinforcement ring, and the upper end is connected to the second lifting plate movably abutted on the mobile frame; the tensioning hole cooperates with the second pull plate positioning pin.

9. The prestressing tensioning device for prestressed steel strands according to claim 1, characterized in that: The synchronization mechanism includes an external sensor arranged on the side wall of the support beam, the guide rod of the external sensor is fixedly connected to the support beam through a clamping seat, the guide rod is horizontally arranged along the length direction of the support beam, and the magnetic ring of the external sensor is movably sleeved on the guide rod; a synchronization fixing plate is provided at the bottom of the movable frame corresponding to the position of the magnetic ring, an L-shaped bracket is provided at the bottom of the synchronization fixing plate, and a connecting piece connected to the L-shaped bracket is provided on the magnetic ring.

10. The prestressing tensioning device for prestressed steel strands according to claim 1, characterized in that: A plurality of connecting beams are respectively arranged between the two longitudinal beams on the lower side, and the movable frame is movably abutted against each connecting beam; a plurality of pads are respectively arranged at the bottom of the two longitudinal beams on the lower side and the bottom of each connecting beam.

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